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<h1>File Upload Recipe</h1>

<h2>问题</h2>

<p>如果你不是很了解表单上传或者CGI的话, 你会觉得文件上传有点奇特.</p>

<h2>解决方法</h2>

<pre><code>import web

urls = ('/upload', 'Upload')

class Upload:
    def GET(self):
        return """&lt;html&gt;&lt;head&gt;&lt;/head&gt;&lt;body&gt;
&lt;form method="POST" enctype="multipart/form-data" action=""&gt;
&lt;input type="file" name="myfile" /&gt;
&lt;br/&gt;
&lt;input type="submit" /&gt;
&lt;/form&gt;
&lt;/body&gt;&lt;/html&gt;"""

    def POST(self):
        x = web.input(myfile={})
        web.debug(x['myfile'].filename) # 这里是文件名
        web.debug(x['myfile'].value) # 这里是文件内容
        web.debug(x['myfile'].file.read()) # 或者使用一个文件对象
        raise web.seeother('/upload')


if __name__ == "__main__":
   app = web.application(urls, globals()) 
   app.run()
</code></pre>

<h2>注意</h2>

<p>需要注意以下内容:</p>

<ul>
<li>表单需要一个enctype="multipart/form-data"的属性, 否则不会正常工作.</li>
<li>在webpy的代码里, 如果你需要默认值的话, myfile就需要默认值了(myfile={}), 文件会以字符串的形式传输 -- 这确实可以工作, 但是你会丢失文件的名称</li>
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    <p>started by <a style="color: gray;" href="http://www.aaronsw.com/">Aaron Swartz</a> (<a style="color: black;" href="mailto:webpy@aaronsw.com">webpy@aaronsw.com</a>)</p>

<p><a href="https://github.com/webpy/webpy.github.com/blob/master/cookbook/fileupload.zh-cn.md">fork this page on GitHub</a></p>
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